Eyepiece Calculator

Fill in the focal length of your telescope, and either select an eyepiece or, type in an eyepiece focal length and apparent field of view. If you type in your own eyepiece information, you will need to click the calculate button to perform the calculation.

Telescope Focal Length

mm

EyePiece

Eyepiece Focal Length

mm

Apparent Field Of View

degrees

Calculated Magnification

Calculated True Field Of View

degrees

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